# TechnologyChecker, free, GET /v1/domain/{domain}/changes: Tech stack API

> What a single domain recently added and dropped, with confidence scoring and the same accuracy guards as the Signals API.

TechnologyChecker's tech stack API on its Free plan. It costs $0.00 per 1,000 companies. It returns 2 of the 13 key fields we check: Technology, Categories.
We rank 193 plans by price. [Botoi's $199 monthly plan](https://datacircle.dev/company-technology-apis/botoi/199-monthly/llms.txt) costs the least per 1,000 companies: as little as $0.0066. Botoi's $199 monthly plan covers up to 1,000,000 companies a day.
[Store Leads's $250 monthly plan (/json/api/v1/all/domain/bulk)](https://datacircle.dev/company-technology-apis/store-leads/250-monthly-pro-post-json-api-v1-all-domain-bulk/llms.txt) covers any number of companies. Store Leads's $250 monthly plan costs more to start than Botoi's $199 monthly plan.
[JobsPipe](https://datacircle.dev/company-technology-apis/jobspipe/348-monthly-scale-post-v1-stack-scan/llms.txt), [Botoi](https://datacircle.dev/company-technology-apis/botoi/9-monthly/llms.txt) and [DetectZeStack](https://datacircle.dev/company-technology-apis/detectzestack/79-monthly-mega-get-analyze/llms.txt) are the best tech stack API providers in our benchmark.

- This page: https://datacircle.dev/company-technology-apis/technologychecker/free-get-v1-domain-domain-changes
- [Best tech stack API in 2026](https://datacircle.dev/best-tech-stack-api.txt)
- Get it: https://technologychecker.io/pricing
- Request: `GET https://api.technologychecker.io/v1/domain/{domain}/changes`
- API key: with the plan, on https://technologychecker.io/pricing
- Its API docs: https://technologychecker.io/docs/api-reference/domain-technologies/get-domain-changes-api
- Sold by: TechnologyChecker (https://technologychecker.io)
- Checked: 2026-10-20

## In the answer

- Completeness: 15%
- Technology: ✓
- Categories: ✓

## Price

- $ per 1,000 companies: $0.00
- Per: call
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Also pays for: Signal types index · List alerts API · Create alert API · Get alert API · Update alert API · Delete alert API · Test alert delivery API: roughly 10 per hour per key · Alert delivery log API · Create audience API: uploads are free · List audiences API · Get audience API · Update audience API: renaming is free · Delete audience API · List audience members API · Search technologies for lead lists API · Technology ID map API · Preview lead list count API · List lead lists API · Preview lead list API · Export lead list API · Delete lead list API · from the same budget: Domain lookup · Domain history · Find domains by technology · Technology lookup / search · Technology stats API · Technology usage trends API · Market share · Get companies by technology · Company lookup · Company search · Batch company lookup (1 per domain) · Adoption and churn signals API · Competitive switch API · Category whitespace API · Audience technology report · Audience breakdown · Segment technology stats · Build a computed audience · Live technology lookup · AI extractor · Create lead list API (1 per delivered row) · Export signals to CSV API (1 per exported row) · Churn validation · Audience refresh crawl · Alert crawl cadence

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: What a single domain recently added and dropped, with confidence scoring and the same accuracy guards as the Signals API.

## Data

- Freshness: stored
- Keep data: Cached data must be refreshed at intervals consistent with your subscription plan
- Use data: You may integrate API data into your internal business applications, CRM systems, and workflows [...] You may not redistribute raw API data to third parties or make it publicly accessible without our written consent [...] You may not use API data to create a competing technology detection service or database [...] You must comply with all applicable data protection laws when processing personal data obtained through the API [...] The following activities are strictly prohibited: [...] Reselling, redistributing, sublicensing, or otherwise making the Service or its data available to third parties without our prior written consent [...] Using the Service or its data to build a competing product, service, or database [...] Using the Service to send unsolicited commercial communications (spam), including bulk emails, cold calls, or messages to contacts obtained through the Service without a legitimate legal basis

## Plan

- Pay: $0
- You get: 100 credits a month
- Enough for: 100 calls a month
- Expires: at the monthly reset, credits don't roll over

## Rate limit

- Per second: 1
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: domain. Optional: window, include_first_seen
- Method: GET
- Path: /v1/domain/{domain}/changes

## About the plan

- Plan: Free
- Who can get it: anyone 18 or over, for individual evaluation: the free plan may not be used for commercial-scale operations

## The 16 fields the plan's answer can hold

domain, technologies, technology ID, technology category, subdomains, technology change type, technology change date, technology detection URL, technology detection count, technology detection rate, churn reliability, change confidence score, change confidence label, change confidence guard, added technologies count, dropped technologies count

## TechnologyChecker's plans (6)

- [TechnologyChecker, free, GET /v1/domain/{domain}/changes](https://datacircle.dev/company-technology-apis/technologychecker/free-get-v1-domain-domain-changes/llms.txt): $0.00 per 1,000, 15% complete, stored
- [TechnologyChecker, $89 monthly, Pro, GET /v1/domain/{domain}/changes](https://datacircle.dev/company-technology-apis/technologychecker/89-monthly-pro-get-v1-domain-domain-changes/llms.txt): $8.90 per 1,000, 15% complete, stored
- [TechnologyChecker, $249 monthly, Scale, GET /v1/domain/{domain}/changes](https://datacircle.dev/company-technology-apis/technologychecker/249-monthly-scale-get-v1-domain-domain-changes/llms.txt): $4.98 per 1,000, 15% complete, stored
- [TechnologyChecker, $890 yearly, Pro, GET /v1/domain/{domain}/changes](https://datacircle.dev/company-technology-apis/technologychecker/890-yearly-pro-get-v1-domain-domain-changes/llms.txt): $7.417 per 1,000, 15% complete, stored
- [TechnologyChecker, $2,490 yearly, Scale, GET /v1/domain/{domain}/changes](https://datacircle.dev/company-technology-apis/technologychecker/2490-yearly-scale-get-v1-domain-domain-changes/llms.txt): $4.15 per 1,000, 15% complete, stored
- [TechnologyChecker, contact us, Enterprise, GET /v1/domain/{domain}/changes](https://datacircle.dev/company-technology-apis/technologychecker/contact-us-enterprise-get-v1-domain-domain-changes/llms.txt): 15% complete, stored

## TechnologyChecker's calls for this API (5)

- `GET /v1/domain/{domain}/changes`: [TechnologyChecker, free, GET /v1/domain/{domain}/changes](https://datacircle.dev/company-technology-apis/technologychecker/free-get-v1-domain-domain-changes/llms.txt)
- `GET /v1/domain/{domain}/history`: [TechnologyChecker, free, GET /v1/domain/{domain}/history](https://datacircle.dev/company-technology-apis/technologychecker/free-get-v1-domain-domain-history/llms.txt)
- `GET /v1/domain/{domain}`: [TechnologyChecker, free, GET /v1/domain/{domain}](https://datacircle.dev/company-technology-apis/technologychecker/free-get-v1-domain-domain/llms.txt)
- `POST /v1/technology-lookup-live`: [TechnologyChecker, free, POST /v1/technology-lookup-live](https://datacircle.dev/company-technology-apis/technologychecker/free-free-post-v1-technology-lookup-live/llms.txt)
- `GET /v1/technology-lookup-live`: [TechnologyChecker, free, GET /v1/technology-lookup-live](https://datacircle.dev/company-technology-apis/technologychecker/free-free-get-v1-technology-lookup-live/llms.txt)

## TechnologyChecker's APIs (3)

- [TechnologyChecker: company discovery API pricing, 6 plans, GET /v1/signals/{type}](https://datacircle.dev/company-discovery-apis/technologychecker/free-get-v1-signals-type/llms.txt)
- [TechnologyChecker: company discovery API pricing, 6 plans, GET /v1/signals/whitespace](https://datacircle.dev/company-discovery-apis/technologychecker/free-get-v1-signals-whitespace/llms.txt)
- [TechnologyChecker: company discovery API pricing, 6 plans, GET /v1/signals/switch](https://datacircle.dev/company-discovery-apis/technologychecker/free-get-v1-signals-switch/llms.txt)
- [TechnologyChecker: company discovery API pricing, 6 plans, POST /v1/leads/create](https://datacircle.dev/company-discovery-apis/technologychecker/free-post-v1-leads-create/llms.txt)
- [TechnologyChecker: company discovery API pricing, 6 plans, GET /v1/signals/{type}/export](https://datacircle.dev/company-discovery-apis/technologychecker/free-get-v1-signals-type-export/llms.txt)
- [TechnologyChecker: company discovery API pricing, 6 plans, GET /v1/technology/name/{name}/domains](https://datacircle.dev/company-discovery-apis/technologychecker/free-get-v1-technology-name-name-domains/llms.txt)
- [TechnologyChecker: company discovery API pricing, 6 plans, GET /v1/technology/{id}/companies](https://datacircle.dev/company-discovery-apis/technologychecker/free-get-v1-technology-id-companies/llms.txt)
- [TechnologyChecker: company discovery API pricing, 6 plans, GET /v1/companies](https://datacircle.dev/company-discovery-apis/technologychecker/free-get-v1-companies/llms.txt)
- [TechnologyChecker: company enrichment API pricing, 6 plans, POST /v1/companies/batch](https://datacircle.dev/company-enrichment-apis/technologychecker/free-post-v1-companies-batch/llms.txt)
- [TechnologyChecker: company enrichment API pricing, 6 plans, GET /v1/company/{domain}](https://datacircle.dev/company-enrichment-apis/technologychecker/free-get-v1-company-domain/llms.txt)
- [TechnologyChecker: tech stack API pricing, 6 plans, GET /v1/domain/{domain}/changes](https://datacircle.dev/company-technology-apis/technologychecker/free-get-v1-domain-domain-changes/llms.txt)

## TechnologyChecker: tech stack API alternatives

- [DetectZeStack, $29 monthly, Ultra, GET /changes](https://datacircle.dev/company-technology-apis/detectzestack/29-monthly-ultra-get-changes/llms.txt): $2.90 per 1,000, 15% complete, stored
- [Tomba, $49 monthly](https://datacircle.dev/company-technology-apis/tomba/49-monthly/llms.txt): $3.267 per 1,000, 15% complete, stored
- [The Swarm, $96,000 yearly](https://datacircle.dev/company-technology-apis/the-swarm/96000-yearly/llms.txt): $4.00 per 1,000, 38% complete, stored
- [Skrapp, $13,488 yearly, Enterprise 500K, POST /api/v3/companies/bulk-enrich](https://datacircle.dev/company-technology-apis/skrapp/13488-yearly-enterprise-500k-post-api-v3-companies-bulk-enrich/llms.txt): $4.496 per 1,000, 23% complete, stored

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-20.

- https://technologychecker.io/docs/api-reference/credits
- https://technologychecker.io/docs/api-reference/domain-technologies/get-domain-changes-api
- https://technologychecker.io/docs/api-reference/openapi.json
- https://technologychecker.io/docs/api-reference/rate-limits
- https://technologychecker.io/docs/features/our-data
- https://technologychecker.io/pricing
- https://technologychecker.io/terms-of-use